They say this may have led to unauthorized access to credit and debit card information, and that they have notified law enforcement authorities. Zaxby's has not specified dates during which the breach may have happened.

The company has not yet been able to tell whether information left the system, however. Zaxby's has since started adding additional security measures to prevent future breaches.

Zaxby's requests that customers who have been to these locations monitor their financial account activity. They are offering guests a free copy of their credit reports by visiting the website www.annualcreditreport.com, by calling (877) 322-8228, or by completing the Annual Credit Report Form.